Dictionary.com

octa-

a combining form occurring in loanwords from Greek and Latin, where it meant “eight” (octagon; octastyle), on this model, used in the formation of compound words, and in chemical terms specialized to mean “having eight atoms” (octavalent).

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Also oct-, octo-.

Origin of octa-

<Greek okta-, combining form of oktṓeight
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for octa- (1 of 2)

octa
/ (ˈɒktə) /

noun

a variant spelling of okta

British Dictionary definitions for octa- (2 of 2)

octa-

combining form

a variant of octo-
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012